16 results about "Covalent functionalization" patented technology

The invention discloses an MOF / nitrogen-doped graphene-based electrocatalyst and a preparation method thereof, nitrogen-doped graphene has a single nitrogen configuration, and the nitrogen-doped graphene is pyridine nitrogen or pyrrole nitrogen; the MOF is ZIF-67, and the MOF is connected with a nitrogen atom of the nitrogen-doped graphene through a coordinate bond. Carrying out covalent functionalization on the surface of the graphene by using a specific pyridine nitrogen configuration polymer; then growing MOF in situ by taking the nitrogen-doped graphene as a precursor, and then calcining to realize the compounding of the nitrogen-doped graphene with the single nitrogen configuration and the MOF. According to the prepared MOF / nitrogen-doped graphene composite electrocatalyst, the stability and the electrocatalytic activity (such as OER, HER and ORR) of MOF can be remarkably improved. Meanwhile, the preparation method is simple in process, low in cost and remarkable in industrial application potential.

The invention relates to a preparation method and application of a reaction type graphene reinforced spherical core-shell structure aluminum oxide-aluminum heat conduction interface material. The preparation method comprises the following steps: performing oxidation treatment on aluminum powder through an oxidizing agent to prepare a hydroxylated Al2O3 (at) Al core-shell structure spherical material, then performing covalent functional modification on the Al2O3 (at) Al core-shell structure spherical material and hydroxylated graphene by using a silane coupling agent, and grafting reactive acrylate functional groups. The thermal interface material is prepared by taking vinyl silicone oil and the like as a polymer matrix and compounding the polymer matrix with Al2O3 (at) Al and hydroxylated graphene filler. According to the thermal interface material, the dispersity of the filler in a silicone oil system is improved, agglomeration of the filler in a polymer matrix is reduced, the interface compatibility between the filler and silicon resin can be effectively improved, the flowing property of the thermal interface material is improved, meanwhile, the thermal interface material has a good heat conduction effect, and the contact thermal resistance is effectively reduced. The preparation method is simple, low in cost, high in repeatability, universal and suitable for large-scale industrial production, the thermal conductivity of the thermal interface material can be regulated and controlled to be 3.169-7.811 W.m <-1 >. K <-1 >, the interface thermal resistance can be regulated and controlled to be 0.0315-0.8792 K.cm < 2 >. W <-1 >, and the contact thermal resistance can be regulated and controlled to be 0.0129-0.3235 K.cm < 2 >. W <-1 >.

The application belongs to the technical field of graphene material preparation, and particularly relates to a general covalent functionalized graphene (CFG) electrochemical preparation method, which comprises the following steps: (1) under the condition of a light sealing oil seal, graphite electrodes are subjected to electrochemical intercalation treatment by using concentrated sulfuric acid; (2) after the intercalation is completed, light sealing oil is injected into an electrolytic cell while the concentrated sulfuric acid is discharged; (3) in the electrolytic cell, a micro-liquid film reaction zone is constructed by using the density and phase solubility difference of the light sealing oil, the aqueous electrolyte and the heavy sealing oil, and the micro-liquid film reaction zone is contacted with the intercalated graphite electrode to make the intercalated graphite electrode electrochemically oxidized to generate CFG; (4) by controlling the relative intercalated graphite electrode of the micro-liquid film reaction zone to move directionally, the whole intercalated graphite electrode is gradually and completely converted into CFG; (5) the CFG structure after the reaction is placed into a solvent to be mechanically exfoliated to prepare a CFG dispersion liquid, and the CFG powder is obtained after drying treatment.

The present invention relates to a bifunctionalized graphene oxide nonlinear optical nanohybrid material and its preparation and application. First, the carbonyl group at the edge of the graphene oxide is converted into dicyanomethylene through a Knoevenagel condensation reaction, and then porphyrin molecules are covalently grafted on the surface of the graphene oxide through a free radical addition reaction, thereby achieving bicovalent functionalization of the graphene oxide. By chemically bonding the electron-donating porphyrin and the dicyanomethylene with strong electron-pulling properties to the graphene surface, the electron and energy transfer process between the porphyrin and the graphene oxide is strengthened, thereby enhancing the third-order nonlinear optical properties of the organic-inorganic hybrid material. The present invention enriches the chemical modification methods of graphene oxide, and the obtained materials have broad application prospects in optoelectronic fields such as nonlinear optical devices.

The application discloses a kind of covalent functionalization MXene artificial synapse and preparation method thereof, it is related to the technical field of artificial intelligence, the present application aims at solving how to enrich the overall characteristics of brain-like neural chip, promote artificial intelligence technology problem, the present application includes including following steps: selecting substrate;Utilize photoetching process on the substrate on gate, source and drain are patterned and are handled, in utilizing electron beam evaporation deposition metal layer and stripping obtains metal electrode pattern;Utilize photoetching process on the substrate on channel region is patterned and is handled;MAX phase material is obtained by in-situ acid etching combined with mechanical stripping few-layer T X MXene;Form uniform T i3C2T X MXene film on the substrate by coating process, and obtain channel region pattern by stripping;Preparation of iodonium salt solution, prepared device is immersed in iodonium salt solution so that it is completed covalent functionalization;Preparation of electrolyte solution, on T i3C2T X MXene channel layer, gate and exposed substrate drop casting electrolyte.

The invention provides a superconducting graphene conductive agent and a preparation method thereof and an alkaline zinc-manganese battery, the superconducting graphene conductive agent comprises carbon black, carbon nanotubes, graphene and a solvent, the carbon black is dispersed by a micromolecular dispersant, the carbon nanotubes are covalently functionalized, the graphene is dispersed by a macromolecular dispersant, and the solvent is covalently functionalized. And the specific surface areas of the carbon black, the carbon nanotubes and the graphene are sequentially increased to form a gradient, so that a multi-dimensional three-dimensional synergistic efficient conductive network is constructed. According to the conductive agent, a multi-dimensional, three-dimensional and stable efficient conductive network is constructed by using carbon material gradients with different structures, different specific surface areas and different dosage proportions, and meanwhile, a dispersing agent with a corresponding size or functionalization is selected according to the characteristics of the carbon material, so that the problem that the carbon material is difficult to uniformly disperse in composite use is effectively solved. The alkaline zinc-manganese battery using the conductive agent has excellent rate capability and long high and low temperature service life.

The invention belongs to the technical field of graphene modification, and particularly relates to a covalent functionalized graphene nanosheet and a preparation method thereof. According to the technical scheme, carboxymethyl chitosan (CMCS) is used for assisting ball milling to disperse and modify graphene, and covalent functionalization and physical stripping of graphene are synchronously achieved. According to the method, the technical problem that large-scale stripping and functionalization of graphene are difficult due to interlayer strong Van der Waals force and surface chemical inertness is effectively solved, and the defects that a traditional method is complex in process, harsh in condition or unfriendly to environment are overcome. The method has the advantages that the process is green and efficient, the yield of the functionalized graphene is as high as 72.3%, the dispersion concentration of the functionalized graphene in water can reach 14.8 mg / mL, the stability is excellent, and important theoretical and experimental basis is provided for expanding the practical application of the graphene in the fields of thermal management and the like.

The invention discloses an N-beta-CD covalent functionalized microporous carbon nanosheet / Pebax-1657 mixed matrix membrane as well as a preparation method and application thereof, and belongs to the technical field of gas separation membranes. The membrane is composed of 10-35.0 wt% of N-beta-CD-MCNs and 65.0-90 wt% of Pebax-1657, the filler is uniformly dispersed in a polymer matrix in a single sheet layer form and is formed in one step through electrostatic spraying, and the thickness of the membrane is 5-50 [mu] m. The preparation method comprises the following steps: firstly oxidizing a microporous carbon nanosheet, then covalently grafting beta-cyclodextrin to the surface of the microporous carbon nanosheet through EDC / NHS catalysis, and carrying out amidation treatment on residual carboxyl by using an NH4Cl-ammonia water solution to obtain an N-beta-CD-MCNs filler; and finally, dispersing the filler into an n-butyl alcohol solution of Pebax-1657, carrying out ultrasonic-stirring treatment, and then carrying out electrostatic spraying to form the film. The membrane disclosed by the invention has a molecular sieve channel of the microporous carbon nanosheet and a specific adsorption effect of beta-cyclodextrin on CO2, and generates a synergistic effect with a Pebax-1657 matrix, so that the CO2 permeability and CO2 / N2 selectivity are remarkably improved, and the electrostatic spraying process is easy to amplify and has large-scale application potential.

The application belongs to the technical field of graphene material preparation, and particularly relates to a universal covalent functionalized graphene electrolytic preparation device and a use method thereof. Reactant graphite paper electrodes are installed on electrode mounting holes on an electrolytic cell cover of a four-channel electrolytic reaction tank mechanism through a conductive clamp mechanism, the graphite paper conductive clamp mechanism is clamped at the upper end of the graphite paper electrodes, the graphite paper electrodes extend into a main cavity of the electrolytic cell, four groups of liquid delivery systems of a working liquid delivery mechanism are connected to four liquid injection and discharge ports of the four-channel electrolytic reaction tank mechanism through working liquid pipelines, and the four-channel electrolytic reaction tank mechanism, the graphite paper electrode conductive clamp mechanism, the working liquid delivery mechanism and an electrical control mechanism are integrally installed on a shell and an installation integration mechanism. The effective combination of the application and the automatic control components enables the covalent functionalized graphene electrochemical preparation method to be automatically realized through program control.

The invention discloses a preparation method and application of amino acid covalent functionalized graphene, and belongs to the technical field of graphene composite materials. According to the preparation method, a high-energy solid-state ball milling mode is adopted, amino acid with an amphoteric function is grafted on graphene, strong acid, strong alkali or organic solvents are not needed in the whole process, environmental pollution is avoided, and the sustainable development requirement is met; only ball milling equipment and amino acid raw materials are needed, equipment investment is low, the method is suitable for large-scale production, amino acid covalent bonding is directly achieved through ball milling shearing force, and side reactions of a traditional chemical method are avoided; after the amphoteric amino acid is grafted, the dispersion stability of the graphene in water or a polymer matrix is obviously improved, and the graphene is suitable for the fields of coatings, composite materials and the like; different amino acids are selected to adapt to specific application scenes such as water-based nanofluid and oil paint; in conclusion, the method has important application value in the fields of water-based nanofluids, coatings and polymer modification.

The invention discloses a preparation method of a quinacridone oxide / reduced graphene oxide organic molecular electrode. The preparation method comprises the following steps: firstly, oxidizing quinacridone molecules (QD) in concentrated HNO3 to obtain quinacridone oxide molecules (OQD); the generated OQD is a nitrogen-containing carbonyl compound with an intramolecular complete pi conjugated structure, reduced graphene oxide (rGO) is taken as a conductive substrate through a non-covalent functionalization strategy, the conductive substrate is anchored on the surface of the reduced graphene oxide by utilizing a solvothermal self-assembly method, and strong pi-pi interaction exists between the OQD and the rGO, so that the OQD is prepared. The conjugated carbonyl all-carbon organic molecular electrode material OQD / rGO is prepared, and the electrochemical performance of the conjugated carbonyl all-carbon organic molecular electrode material OQD / rGO is researched. The all-carbon organic molecule electrode material has high specific capacitance, good rate capability and excellent cycling stability. In addition, in order to research the actual energy storage performance, the asymmetric supercapacitor (PDQ / rGO / / OQD / rGO) assembled by the OQD / rGO and the quinone-rich polymer modified rGO (PDQ / rGO) has excellent energy storage performance.

The invention discloses a preparation method of a carbon quantum dot reinforced hydrotalcite material and application of the carbon quantum dot reinforced hydrotalcite material as a heavy metal adsorbent. The method comprises the following steps: adding hydrotalcite and carbon quantum dots into ultrapure water, carrying out vigorous stirring reaction at room temperature, centrifuging, washing with ethanol, and drying. According to the invention, hydrotalcite is subjected to non-covalent functionalization by using carbon quantum dots rich in-NH2 and-COOH, such that the carbon quantum dot reinforced hydrotalcite material is obtained. -NH2 and-COOH in the carbon quantum dots have relatively strong binding capacity to calcium ions dissolved out from the hydrotalcite laminate, and after the divalent metal is coordinated with the groups on the surfaces of the carbon quantum dots, more calcium vacancies with lower energy barriers are formed on the hydrotalcite laminate. The existence of calcium vacancies is beneficial to rapid generation of isomorphous substitution and generation of a cadmium hydroxide molecular form, and the adsorption speed and the adsorption efficiency of the material are improved. The carbon quantum dot reinforced hydrotalcite material has an important application prospect in the field of heavy metal pollution emergency treatment or high-performance adsorbent development.

The application provides a boron nitride nanosheet and a preparation method thereof. A eutectic solvent prepared from lidocaine and thymol is used to replace a traditional organic solvent to strip h-BN (hexagonal boron nitride), and ball milling and liquid-phase ultrasonic are combined to efficiently prepare BNNS (boron nitride nanosheet). Meanwhile, the non-covalent functionalization of BNNS is realized by using the pi-pi interaction. The method is green, environmentally friendly, simple to operate and low in cost, and can meet the demand of efficiently preparing functionalized BNNS.

The present disclosure provides single-walled carbon nanotubes (SWCNTs) covalently functionalized with a plurality of molecules derived from monomers (e.g., acrylate monomers, acrylamide monomers, and styrene monomers), alcohols, amines, amino acids, alkyls, heteroaromatics, aryls, or carboxylic acids, and methods for preparing the same via Fenton-like reactions. The functionalized SWCNTs of the present technology may be useful as near-infrared single-photon emitters, optical sensors, and as fluorophores for bioimaging and super-resolution microscopy.

The invention relates to the field of chemistry, in particular to a monatomic catalytic material surface functionalization method and an obtained functionalized monatomic catalytic material. The monatomic catalytic material surface functionalization method provided by the invention comprises the following steps: S1, providing a monatomic catalytic material; and S2, carrying out surface covalent functionalization on the monatomic catalytic material. The covalent functionalization of the surface of the monatomic catalytic material carrier is realized on the premise of not influencing the coordination relationship between metal atoms and heteroatoms in the carrier; a functional group capable of further reacting or modifying is introduced into the surface of the carrier, so that a chemical gripper is provided for subsequent functionalization; the catalyst is suitable for various heteroatom-doped carbon-based carrier systems, is insensitive to metal types and contents, and has good universality; and a stable and reliable technical method is provided for constructing a composite functional monatomic catalytic material.